Use decks.com beam sizing calculator.
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Beam Sizes (Based on No. 2 or better Ponderosa Pine and Southern Pine Treated for weather and/or ground exposure) |
X = Joist Length
| X |
Species |
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Post Spacing |
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| |
|
4' |
5' |
6' |
7' |
8' |
9' |
10' |
11' |
12' |
13' |
14' |
| 6' |
SYP |
1-2x6 |
1-2x6 |
1-2x6 |
2-2x6 |
2-2x6 |
2-2x6 |
2-2x8 |
2-2x8 |
2-2x10 |
2-2x10 |
2-2x10 |
| |
P P |
1-2x6 |
1-2x6 |
2-2x8 |
2-2x8 |
2-2x8 |
2-2x8 |
2-2x10 |
2-2x10 |
2-2x12 |
2-2x12 |
3-2x10 |
| 7' |
SYP |
1-2x6 |
1-2x6 |
1-2x6 |
2-2x6 |
2-2x6 |
2-2x8 |
2-2x8 |
2-2x10 |
2-2x10 |
2-2x10 |
2-2x12 |
| |
P P |
1-2x6 |
1-2x6 |
1-2x8 |
2-2x8 |
2-2x8 |
2-2x10 |
2-2x10 |
2-2x10 |
2-2x12 |
3-2x10 |
3-2x10 |
| 8' |
SYP |
1-2x6 |
1-2x6 |
2-2x6 |
2-2x6 |
2-2x8 |
2-2x8 |
2-2x8 |
2-2x10 |
2-2x10 |
2-2x12 |
2-2x12 |
| |
P P |
1-2x6 |
2-2x6 |
2-2x8 |
2-2x8 |
2-2x8 |
2-2x10 |
2-2x10 |
2-2x10 |
3-2x10 |
3-2x10 |
3-2x12 |
| 9' |
SYP |
1-2x6 |
1-2x6 |
2-2x6 |
2-2x6 |
2-2x8 |
2-2x8 |
2-2x10 |
2-2x10 |
2-2x12 |
2-2x12 |
3-2x10 |
| |
P P |
1-2x6 |
2-2x6 |
2-2x8 |
2-2x8 |
2-2x10 |
2-2x10 |
2-2x10 |
3-2x10 |
3-2x10 |
3-2x12 |
3-2x12 |
| 10' |
SYP |
1-2x6 |
1-2x6 |
2-2x6 |
2-2x6 |
2-2x8 |
2-2x8 |
2-2x10 |
2-2x12 |
2-2x12 |
3-2x10 |
3-2x10 |
| |
P P |
1-2x6 |
1-2x6 |
2-2x8 |
2-2x8 |
2-2x10 |
2-2x10 |
2-2x12 |
3-2x10 |
3-2x12 |
3-2x12 |
Eng Bm |
| 11' |
SYP |
1-2x6 |
2-2x6 |
2-2x6 |
2-2x8 |
2-2x8 |
2-2x10 |
2-2x10 |
2-2x12 |
2-2x12 |
3-2x10 |
3-2x12 |
| |
P P |
2-2x6 |
2-2x6 |
2-2x8 |
2-2x8 |
2-2x10 |
2-2x12 |
2-2x12 |
3-2x10 |
3-2x12 |
3-2x12 |
Eng Bm |
| 12' |
SYP |
1-2x6 |
2-2x6 |
2-2x6 |
2-2x8 |
2-2x8 |
2-2x10 |
2-2x10 |
2-2x12 |
3-2x10 |
3-2x10 |
3-2x12 |
| |
P P |
2-2x6 |
2-2x6 |
2-2x8 |
2-2x10 |
2-2x10 |
2-2x12 |
2-2x12 |
3-2x12 |
3-2x12 |
Eng Bm |
Eng Bm |
| 13' |
SYP |
1-2x6 |
2-2x6 |
2-2x6 |
2-2x8 |
2-2x8 |
2-2x10 |
2-2x10 |
2-2x12 |
3-2x10 |
3-2x12 |
3-2x12 |
| |
P P |
2-2x6 |
2-2x6 |
2-2x8 |
2-2x10 |
2-2x12 |
2-2x12 |
2-2x12 |
3-2x12 |
3-2x12 |
Eng Bm |
Eng Bm |
| 14' |
SYP |
1-2x6 |
2-2x6 |
2-2x6 |
2-2x8 |
2-2x10 |
2-2x10 |
2-2x12 |
3-2x10 |
3-2x12 |
3-2x12 |
3-2x12 |
| |
P P |
2-2x6 |
2-2x8 |
2-2x8 |
2-2x10 |
2-2x12 |
3-2x10 |
3-2x12 |
3-2x12 |
Eng Bm |
Eng Bm |
Eng Bm |
| 15' |
SYP |
2-2x6 |
2-2x6 |
2-2x8 |
2-2x8 |
2-2x10 |
2-2x12 |
2-2x12 |
3-2x10 |
3-2x12 |
3-2x12 |
Eng Bm |
| |
P P |
2-2x6 |
2-2x8 |
2-2x8 |
2-2x10 |
3-2x10 |
3-2x10 |
3-2x12 |
3-2x12 |
Eng Bm |
Eng Bm |
Eng Bm |
| 16' |
SYP |
2-2x6 |
2-2x6 |
2-2x8 |
2-2x8 |
2-2x10 |
2-2x12 |
2-2x12 |
3-2x10 |
3-2x12 |
3-2x12 |
Eng Bm |
| |
P P |
2-2x6 |
2-2x8 |
2-2x10 |
2-2x10 |
3-2x10 |
3-2x10 |
3-2x12 |
3-2x12 |
Eng Bm |
Eng Bm |
Eng Bm |
Joist sections cantilevered over beams must be calculated as (2x length) for beam sizing.
SYP= Southern Yellow Pine